They often become angry when things do not happen the way they planned.

VOA: special.2009.03.24

But it would often happen that there were not enough Corinthians who were ready to go with you on your expedition.

但是经常会没有足够的人,愿意与你一同踏上征程

耶鲁公开课 - 古希腊历史简介课程节选

When it does happen, and it happens too often for my liking, the students just get a zero.

如果真的有人抄袭了，把我惹毛了，我就会给学生打零分。

对于抄袭的想法 - SpeakingMax英语口语达人

Or, they may happen more and more often and become worse.

VOA: special.2009.01.06

If they have an underperforming fund, sometimes they allow it to die a dignified death; although, that doesn't happen very often.

如果他们旗下有一支表现不佳的基金,他们可能会让基金退市,当然这种情况不常发生

耶鲁公开课 - 金融市场课程节选

Chronic tension headaches happen more often.

VOA: special.2010.03.30

That's why your operating systems and your personal computers often crash for no apparent reason. Just because two things happen to, once in a while, occur at the same time.

这就是为什么你的电脑或者操作系统,经常会毫无预兆的崩溃了,这是因为两件事情正好同时发生了，通常还有人工输入。

麻省理工公开课 - 计算机科学及编程导论课程节选

"We recommended hemorrhage drills just like fire drills. For an event that doesn't happen very often, people need to practice.

VOA: standard.2010.06.23

So, this is an absolutely outstanding discovery, even though, if we think about it, what is the probability that this happened, how often did this happen?

0个alpha粒子，这绝对是一个，很了不起的发现，虽然我们仔细想想？

麻省理工公开课 - 化学原理课程节选

"Something else, which we hope does not happen very often, but which happens from time to time are the accidents which can release huge amounts of chemicals or radioactive-during Chernobyl, the radioactive things.

VOA: standard.2009.03.23

I know this doesn't happen very often. But let's just say this happened.

我明白这种情况并不常见，但我们假设它确实发生了。

I'd better 课堂 - SpeakingMax英语口语达人